I think this might have to do with the fact it was hotlinked while the others were not. The other example I posted, from Miranda, had the name of Cohens hotlinked and was removed while the non-hotlinked names were unaffected. That doesn't appear to be the case with all the links on the site, but it's certainly not confined to the cases Donofrio is freaking out over. In Miranda, the name of Cohens v. Virginia disappears and reappears from the text at exactly the same times as this supposed scrubbing of Minor.
Citations of Minor v Happersett made it to the Supreme Court of the United States for Justices’ conferences in the Petitions for Writs of Certiorari submitted for both Kerchner v Obama (Apuzzo) and Hollister v Soetoro, et. al.(Hemenway).